Born on December 8, 1730, in Breda, Netherlands, Jan Ingenhousz worked as a doctor in London, England, handling pioneering work in smallpox inoculations. He later served as a physician to Austrian monarch Maria Theresa and, after experimentation, articulated the theory of photosynthesis and oxygen production among green-leafed plants. Also doing work in conduction, Ingenhousz died in Calne on September 7, 1799.
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